The Political One Percent of the One Percent in 2014: Mega Donors Fuel Rising Cost of Elections

In the 2014 elections, 31,976 donors — equal to roughly one percent of one percent of the total population of the United States — accounted for an astounding $1.18 billion in disclosed political contributions at the federal level.
Source: The Political One Percent of the One Percent in 2014: Mega Donors Fuel Rising Cost of Elections